【FPGA】多功能ALU
目录
实验要求
源代码
顶层模块
数据输入模块
ALU运算模块
结果处理模块
扫描数码管模块
扫描数码管顶层
分频器
数码管显示
仿真代码
结构层图
管脚配置
实验板卡：xc7a100tlc sg324-2L，共20个开关
实验要求
通过高低位控制，实现32位数据A、B及运算方式的输入，通过8个数码管显示ALU的十六进制运算结果， 通过4个led灯显示4个运算信号ZF SF CF OF（判零、符号、进位、判溢）
源代码
顶层模块
`timescale 1ns / 1ps
module TOP(
input CLK_100M,
input[15:0] in_data,
input ctrl_in,
input rst_,
input CLK_A,
input CLK_B,
input CLK_OP,
input ShowA,
input ShowB,
output[7:0] AN,
output[7:0] SEG,
output[3:0] out_flags
);
wire[31:0] a;
wire[31:0] b;
wire[31:0] res;
wire[31:0] alu_f;
wire[3:0] in_flags;
reg[31:0] out_data;
DataInput A(in_data, ctrl_in, CLK_A, rst_, a);
DataInput B(in_data, ctrl_in, CLK_B, rst_, b); //数据输入
ALU alu(a, b, in_data[3:0], res, in_flags);
ALU_F f(res, in_flags, CLK_OP, rst_, alu_f, out_flags);
LED led(CLK_100M, rst_, out_data, AN, SEG);
always@(ShowA or ShowB)
begin
if(!ShowA)
out_data = a;
else if(!ShowB)
out_data = b;
else
out_data = alu_f;
end
endmodule数据输入模块
`timescale 1ns / 1ps
module DataInput(
input[15:0] data_in,
input ctrl_in,
input clk,
input rst_,
output reg[31:0] data_out
);
always@(negedge clk or negedge rst_)
begin
if(!rst_)
data_out <= 32'b0;
else
begin
if(ctrl_in == 1'b0)
data_out[15:0] <= data_in;
else
data_out[31:16] <= data_in;
end
end
endmoduleALU运算模块
`timescale 1ns / 1ps
module ALU(
input[31:0] a,
input[31:0] b,
input[31:0] op,
output reg[32:0] res,
output reg[3:0] flags
);
// flags: ZF SF CF OF (高位->低位)
// 判零 符号 进位 判溢
always@(*)
begin
case(op)
4'b0000:
begin
res <= a + b;
flags[1] = res[32];
flags[0] = a[31] ^ b[31] ^ res[31] ^ res[32];
end
4'b0001: res <= a << b;
4'b0010: res <= ($signed(a) < $signed(b)) ? 1 : 0;
4'b0011: res <= (a < b) ? 1 : 0;
4'b0100: res <= a ^ b;
4'b0101: res <= a >> b;
4'b0110: res <= a | b;
4'b0111: res <= a & b;
4'b1000:
begin
res <= a - b;
flags[1] = res[32];
flags[0] = a[31] ^ b[31] ^ res[31] ^ res[32];
end
4'b1001: res <= $signed(a) >>> b;
endcase
flags[3] = (res == 32'd0) ? 1 : 0;
flags[2] = res[31];
end
endmodule结果处理模块
`timescale 1ns / 1ps
module ALU_F(
input[32:0] res,
input[3:0] in_flags,
input clk,
input rst_,
output reg[32:0] alu_f,
output reg[3:0] out_flags
);
always@(negedge clk or negedge rst_)
begin
if(!rst_)
begin
alu_f <= 32'b0;
out_flags <= 4'b1000;
end
else if(clk)
begin
alu_f <= res;
out_flags <= in_flags;
end
end
endmodule扫描数码管模块
扫描数码管顶层
`timescale 1ns / 1ps
module LED(
input clk_100M,
input rst_,
input[31:0] data,
output[7:0] AN,
output[7:0] SEG
);
wire clk_ref; //数码管刷新频率：500hz
wire clk_inc; //数字刷新频率：10hz
Fdiv fdiv(clk_100M,32'd100000,clk_ref);
Scanner scanner(data,rst_,clk_ref,AN,SEG);
endmodule分频器
`timescale 1ns / 1ps
module Fdiv(
input clk_in,
input [31:0] count,
output reg clk_out
);
reg[31:0] num;
always@(posedge clk_in)
begin
if(num == count)
begin
clk_out <= ~clk_out;
num <= 1'b0;
end
else
num <= num + 1'b1;
end
endmodule数码管显示
`timescale 1ns / 1ps
module Scanner(
input[31:0] data,
input rst_,
input clk_ref,
output reg[7:0] AN,
output reg[7:0] SEG
);
reg[3:0] data_x;
reg[2:0] bit;
always@(negedge rst_ or posedge clk_ref)
begin
if(!rst_)
bit <= 3'd0;
else
bit <= bit + 1'b1;
end
always@(*)
begin
case(bit)
3'b000: begin AN <= 8'b1111_1110; data_x <= data[3:0]; end
3'b001: begin AN <= 8'b1111_1101; data_x <= data[7:4]; end
3'b010: begin AN <= 8'b1111_1011; data_x <= data[11:8]; end
3'b011: begin AN <= 8'b1111_0111; data_x <= data[15:12]; end
3'b100: begin AN <= 8'b1110_1111; data_x <= data[19:16]; end
3'b101: begin AN <= 8'b1101_1111; data_x <= data[23:20]; end
3'b110: begin AN <= 8'b1011_1111; data_x <= data[27:24]; end
3'b111: begin AN <= 8'b0111_1111; data_x <= data[31:28]; end
endcase
case(data_x)
4'b0000: SEG <= 8'b0000_0011;
4'b0001: SEG <= 8'b1001_1111;
4'b0010: SEG <= 8'b0010_0101;
4'b0011: SEG <= 8'b0000_1101;
4'b0100: SEG <= 8'b1001_1001;
4'b0101: SEG <= 8'b0100_1001;
4'b0110: SEG <= 8'b0100_0001;
4'b0111: SEG <= 8'b0001_1111;
4'b1000: SEG <= 8'b0000_0001;
4'b1001: SEG <= 8'b0000_1001;
4'b1010: SEG <= 8'b0001_0001;
4'b1011: SEG <= 8'b1100_0001;
4'b1100: SEG <= 8'b0110_0011;
4'b1101: SEG <= 8'b1000_0101;
4'b1110: SEG <= 8'b0110_0001;
4'b1111: SEG <= 8'b0111_0001;
endcase
end
endmodule仿真代码
`timescale 1ns / 1ps
module ALU_top_sim();
reg[31:0] a;
reg[31:0] b;
reg[3:0] op;
wire[32:0] res;
wire[3:0] flags; //顺序：ZF、SF、CF、OF
initial
begin
a = 32'h8000_0003;
b = 32'h0000_0001;
#100
op = 4'b0000; //加法
#100
op = 4'b0001; //逻辑左移
#100
op = 4'b0010; //有符号数比较
#100
op = 4'b0011; //无符号数比较
#100
op = 4'b0100; //异或
#100
op = 4'b0101; //逻辑右移
#100
op = 4'b0110; //按位或
#100
op = 4'b0111; //按位与
#100
op = 4'b1000; //减法
#100
op = 4'b1001; //算术右移
end
ALU alu_sim(a,b,op,res,flags);
endmodule
结构层图
管脚配置
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN E3} [get_ports CLK_100M]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN V5} [get_ports in_data[15]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN T4} [get_ports in_data[14]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN V6} [get_ports in_data[13]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN T5} [get_ports in_data[12]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN T6} [get_ports in_data[11]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN V7} [get_ports in_data[10]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN R8} [get_ports in_data[9]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN U9} [get_ports in_data[8]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN T9} [get_ports in_data[7]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN V10} [get_ports in_data[6]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN R10} [get_ports in_data[5]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN U11} [get_ports in_data[4]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN R11} [get_ports in_data[3]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN U12} [get_ports in_data[2]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN T13} [get_ports in_data[1]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN V14} [get_ports in_data[0]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN T14} [get_ports ctrl_in]
set_property CLOCK_DEDICATED_ROUTE FALSE [get_nets rst_]
set_property CLOCK_DEDICATED_ROUTE FALSE [get_nets CLK_A]
set_property CLOCK_DEDICATED_ROUTE FALSE [get_nets CLK_B]
set_property CLOCK_DEDICATED_ROUTE FALSE [get_nets CLK_OP]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN N17} [get_ports rst_]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN P18} [get_ports CLK_A]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN P17} [get_ports CLK_B]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN R18} [get_ports CLK_OP]
set_property CLOCK_DEDICATED_ROUTE FALSE [get_nets ShowA]
set_property CLOCK_DEDICATED_ROUTE FALSE [get_nets ShowB]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN U18} [get_ports ShowA]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN U17} [get_ports ShowB]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN U6} [get_ports out_flags[3]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN R5} [get_ports out_flags[2]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN U7} [get_ports out_flags[1]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN R6} [get_ports out_flags[0]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN C9} [get_ports AN[7]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN C10} [get_ports AN[6]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN D10} [get_ports AN[5]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN C11} [get_ports AN[4]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN M17} [get_ports AN[3]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN J14} [get_ports AN[2]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN K13} [get_ports AN[1]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN P14} [get_ports AN[0]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN F14} [get_ports SEG[7]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN N14} [get_ports SEG[6]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN J13} [get_ports SEG[5]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN G13} [get_ports SEG[4]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN F13} [get_ports SEG[3]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN G14} [get_ports SEG[2]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN M13} [get_ports SEG[1]]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN H14} [get_ports SEG[0]]